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Intermonitor variability of the RT3 accelerometer during typical physical activities.

Sarah M Powell1, Ann V Rowlands

  • 1School of Sport, Health, and Exercise Sciences, University of Wales, Bangor LL57 2PX, Wales, UK.

Medicine and Science in Sports and Exercise
|February 10, 2004
PubMed
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The RT3 accelerometer demonstrates good reliability for tracking physical activity, but significant inter-monitor variability exists, especially at higher intensities. The vertical axis offers the most consistent results for RT3 accelerometer data.

Area of Science:

  • Biomechanics
  • Wearable Technology
  • Sports Science

Background:

  • Actigraphy, using devices like the RT3 accelerometer, is crucial for objective physical activity assessment.
  • Understanding the reliability and variability of these devices is essential for accurate data interpretation.

Purpose of the Study:

  • To evaluate the reliability and inter-monitor variability of eight RT3 accelerometers across various activities.

Main Methods:

  • Eight RT3 accelerometers underwent two trials performing rest, walking (4-6 km/h), running (8-10 km/h), and sit-stand activities.
  • Data from the middle 10 minutes of each 12-minute trial were analyzed using three-way ANOVA for vector magnitude and X, Y, and Z axes.

Main Results:

  • Inter-monitor coefficient of variation was <6% for locomotion but 8-25% for sit-stand.

Related Experiment Videos

  • Significant interactions were found for vector magnitude and Y/Z axes, and activity x monitor for the X axis.
  • Variability increased with activity intensity, with notable inter-monitor differences at higher speeds.

    • Conclusions:

    • RT3 accelerometers exhibit good reliability, but substantial inter-monitor variability is present.
    • The vertical (X) axis demonstrated the least variability, indicating higher reliability.
    • Pre-use assessment of RT3 inter-monitor variability and reliability is recommended.